Repro: ```csharp using System; using System.Runtime.InteropServices; using System.Runtime.CompilerServices; [assembly: DisableRuntimeMarshallingAttribute] object o = new MyStruct[10]; GCHandle h = GCHandle.Alloc(o, GCHandleType.Pinned); struct MyStruct { char c; } ``` Actual result: System.ArgumentException: Object contains non-primitive or non-blittable data. Expected result: No exceptions